The water quality model is an efficient tool for water pollution control and water quality planning.

水质模型是进行水污染控制和水环境质量规划的有效工具。

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Water quality model has become an efficient tool for water pollution control, water quality planning and environmental management.

水质模型是进行环境水污染控制、水质规划和环境管理的有效工具。

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MRP system is not very efficient in production planning and control of job shop, especially of the one that contains three-level structure: shop, subshop and workgroup.

物料需求计划（MRP）系统对于车间层，尤其是基于车间-工段-班组的车间层的作业计划和控制不是很有效的。

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Agencies must establish and maintain a capital planning and investment control process that links mission needs, information, and information technology in an effective and efficient manner.

WHITEHOUSE: CIRCULAR NO. A-130 Revised